Fueiaoe fob boasting ores



1 2 sheets-sheet 1.v

(No Model.)

` P NABF PURNAGE FOR RoAsTING CRBS. No 528:016. LPa.,te\nted`0ot.23,f1994.

2 Sheets-Sheet 12.

mmm ont. 23,1894.,

(No Medef) P. NEP.

` 'FURNAGE- POR 'ROASTING 0RBS No. y528,0l6.

lfjmefses. 7:1. 04%,

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Enom, smhgjasfwin enable-othersskmed1in; the 1Q Itho senile;` referencefbeingy to'the .accom-" pgtnyin g drawgsiand to letters of referencemarked thereon;- wli`ich.:-f9mpartpt' this UNiTED lS'Tiifrlazs- PATENTOFFICE..

PAUL nrt-hinten ARcEN-rgmn, KANSAS- I Yifummcla'FoR RoArsTl'Nec-rones..j

` srEcmcnrroN forming-pact omettere. .Patent No; seeplegnatd october23,1894. A ppntmgn; neanugtsfzt, 189s. rtm1ivo.ts4.'o7o.,- maman' of.Switzerland, residingsat Argentine; in theart to which it"gappertai'nsto. make-and' use ianys'frequisite,- the 'cylindersbeinggenf orally/@bont thirty feet in length,ga.nd driven,V

: are` shown-it respeic-tively.v The. ire-I vbrick'liningvto thefurnace-fis; Withad-vstimmige,l

1 xn-ztdeiol` consi-dernblethickness so as'etofretain other, .the..orepassing into and-.zout c'lifthe' `roast i"n gcy linder ini acontinnnsstrenr, and

the obgectfoffthe'epresent;invention is 'to pros vide sucha;furnace?whichwillgaorda. most intimate contact betweenthel pnlvernlentore I 25';

and thefairladmi'ttedffor the 'combustion of theY sulglur'carried bytheroreseend will proiduce, as @t product; e;perfectly roastedore, Aand,also concentrated-,1 snlphurons scid, gas, by

roasting cylinder.

Ai fnrtherobject; inl view is' tored nce, the Y repair, by System yofiron partitions, .and ein arrap gement'of Fthei-y air inlet ductsif andfur-ifi nace construction -whichf prevents fthe 'del` heat-or the actionthereonof snlphuricecidi generated inthe furnace.

`I`14: .1 struction and-'arrangementhereinafter tiescribed and claimed.

These;objects1 attain byme'ansj oi .the con x 1sA a vertically:longitudinal sectlon of 'er revolving roasting furnace embodying thepresi',

- ent invention. 'I jFiiz; 2 is an end view` of, 'the -dischztrg'eend ofthe same. Fig'.3 isa transf,

verse section taken on the'lne Fig.` 1i

Fig-4. is atransversesecton taken on the v` er se sections of 'aroastingcylinder i1lns-` angle' irons or tiangeslattatched to oreformedf on .thecen'traliron tubeLDl4 the partitionsfsuccessively lift-.the oreand allow it to fall ina. shower throhgh-the holes there `is inserted-asmaller pipe E,"nn air in let-, which pipe extendsfin nearly to the Dvneagrrthe discharge epd of the cylinder, for

. the roastingcylinder as' hereinafter described.'v In mostcases it isnot desirable toallow oreduring' theiirst stage ofroestingfor the heatat'thet p ointis the greatest, andfurthex:

irons here"a.re bolted for. .riveted Atheradi'atl f .iron partition"plates C, C; which-plates, in -the iirstform. of' constructionillustrated, are bolted, OrrivetedQaIOng' their inner edges 'to` 75lllajchotl thejplates isf provided with .a line 'of holes; c, andasthecylinder revolves 8 A. c',-f,ron'1 one of the rndialchamber's formedby *the partitions into the n extfchamber. Thus a shower of nre-is:produced -over thewhole farther endl oftheencompassingpipe D, andissn-pported and stayed to the v'latter bythe rbolts ef. Openings e areprovided in the pipe 495 the passage-of airfromthe central pipe-into'iron constructions te come incontact with the IOO 'if the finoistureisall driven oft `fron1 the l fresh ore before it reaches the iron of 'fof ore, 'which is a great advantage in se the roaster, the destructionof the llatter by' t curing good roasting.

snlphnric acid is avoided. "llo this end the iron partitions,'C, and thecentral tube, l), do not extend entirely through to the receiving end ofthe roasting cylinder, ybut stop/ sho'rtas shown; and the brick .liningof the upper end of the cylinder is provided with 'longitudinally4projecting ledges Il which" 1o formv ore litters that carry up the oreas the cylinder slowly revolves, and/allow it to fall back in showers. l

The upper end of the cylinder tits closel-y against the face of thel*stationary line Vl, i 5 which may lead to aV chimney stack or to appliances for treating or saving the sulphurous or' other gases producedby the roasting process. Afeed'ehutefor the oreis shown at R and the oreis fed'into the cylinder ina zo steadystream, by any suitablevautomatic. feeding device in the usual way. In the present case a feedhopper and Achute simply are shoWn,lit not being necessary to illus-'trat'e the details of an automatic, feeder.

Thesnccessful operation of the roasting furnace req'uiresgthe exclusionof .all air except such asenters through the ai'rinletpipe E and becomesWarneA before itre'aches "the ore, and also calls for a uniform andauto- -matic discharge ofthe roasted ore. For this purpose there aredischarge openings f, in the-.discharge end d of the cylinder, oneopening for each longitudinal section'r apartment. These openings arenormally closed 3 5 by means of thefspring pressed covers or doors g,each of which is hinged to a support' ing arm g', and has an outwardlyextending arm Y his the spring. for hold itsseat.

G' is a stationary rod or cam surface conforming in curvatureltothe,diameter of the cylinder as will appear fromllig. 2, and so placed withrespect to the end of the roastingcylinder that 'itwill engage with therods t' and press them back, opening the discharge holes f as theysuccessively approach the bottom position, and holdthem` open for ashort' period. After eachv rod t' has passed the stationary ycam rod G,the cover closes down on itsopening till the furnace has again made arevolution, and the opening remains closed against the admission of coldair.. In connection with each opening, f, there is a slide 5 5 K 'whichcan 'be pushed in more or less in order to reduce the` size of theopening f. The openings f when fully opened extend to the inner edge ofthe cylinder lining, and by-pushing in the slide K, lit will be seenthat a barrier lis formed againstthe free discharge of allore resting atthat point on the bottom ofthe cylinder. Qnly such'ore as can flow overthe inwardly projected end of the slide" plate K can be discharged;Hence the amount of ore inthe furnace can thus be regulated at willaccording tothe character ing the door against lt will be seen that itis not material how many of the iron partitions the furnace has. 7oinstead ot four as above described there may be six, as illustrated byFig, 5,- and in this casethere would be six discharge openings. ln VFig'each of the parti-tion plates C2 is bent laterally and riveted along its-inner edgeto the adjacent plate, thus inclosing a' central space whichperforms thefunction'of the tube D in the first construction.

The operation. of the furnace is briefly as follows: `The ore beingvfedin steadily and con. 8o tinuously through the'feed spout R it enters vthe upper end of thecylinder andas the latter slowly revolves it iscarried up by the ledges II, and later bythe partitions Chaud show eredthrough the openingsjc, thus giving an 'intimate and oft repeatedcontact between the ore particles and the hot air.` Finally when the ore.reaches the lower end of the cylinder it discharges through theopenings f, the same being automatically opened for a` short period oftim`e,'as before described,

I when they reach the lower part of .the cylin. ders revolution, andthen closed for the rest of the circle. The ai-r'enters only through thecenter pipe E yand natural dr'aft'alone may be used or it may be forcedin by means `ot` a fan orblower. .Passing in to the farther end of thepipe E it theny returns through the annular passage around the pipe Eand within the -pipe D, or inthe case of the construction illustrated byFig. 6 through the tight central channel around the pipe E. The air thenenters the roasting part of the furnace through the holes e.- During thepas. vsage of the air along the red hot iron it is heated, and the iron,especially at the inner end 'of the flue D where the heat from theroasting of .the freshore is the greatest, is cooled' and preserved fromdestruction. A- part of the superfluous heat, which is produced by theintense combustion of fresh ore near the feeding end of the furnace, isthus transported to the discharging end, wherein ordinary furnaces alarge volume of cold air meets-partially burned ore and reduces the'heat below the roasting temperature. lf ore is to be roasted which doesnot furnish enough heatvby its own combustion, the air can be heated'before it is introduced through the pipe E. y Having thus describ Iclaim as new is- 1. "A revolving roasting furnace' having a centralmetal air inlet pipe receiving air in at one'end and with openingstherefrom into the roasting cylinder only at the discharge end thereof,in combination with metal par` titions connecting said central pipe withthe cylinder walls, said partitions having holes for the passage of oretherethrough, substaned theviuvention, what tially as and for thepurpose set forth.

2. ln a revolving roasting cylinder the com- IOO binationwith' anLinner. air inlet ,pipe leading in 'from the discharging end of thefurnace' toward the'feeding end, of'an outer pipe en# oompassingtheisame and forming a' return passage for the incoming air back to thedischarging4 end, said outer pipe having air pas,-`

j sages from .the same into the roasting chamber only at the'ldischarging end of the cylinder, substantially as and for the purposeset forth.

' Y 3. A revolving roastinglcylinder having an op'en section at thefeeding end with-lining.

and `ore lifting devices carried thereby of fire brick, in combinationwith a metal airinlet pipe and ore lifting partitions extending throughthe lowerportion of thecylinder,

radially and outwardly projecting arm4 thereso placed as to engage withsaid arms and temporarily open the doors, substantially as l l 3 and forthe purpose set forth. f

I5. A revolving roasting cylinder having an 4open section at the feedingend with lining [and ore lifting devices of fire brick, inv combinationwith` an air inlet flue and metal ore,

lifting devices extending through the lower portion of the cylinder,said air inlet flue discharging air into theroasting chamber nearth'edischarge end thereof, substantially as and for the' purpose setforth.

6.- A4 revolving roasting cylinder having oneor more discharge openingsin the end thereof, said openings extending inward from the surface ofthe'furnace lining, with movableslides therefor adapted to be movedradially inward, whereby the amount of ore retained in the cylinder canbe regulated, substantially as set forth.

i. PAUL` NAEF. Witnesses:

.G. GARTON, S. B. DAVIS.

'for,"in' combination with a stationary piece

